Is liquid gas an element mixture or compound?

Answer 1

A compound is where the elemental components are chemically bonded at the molecular level and can only be separated with great effort (not evaporation). The liquid could have been a mixture (hard water for example; water with minerals, fluoride, calcium, salt whatever) and the dissolved minerals left behind when the liquid evaporated. However the liquid itself could be a compound (such as pure water) but the fact it left behind 'impurities' when it evaporated means it became a mixture or colloid when the impurities mixed into the liquid. So if the container was completely clean when the liquid was put in and there was no possibility of impurities being introduced from the air or other sources, it was a mixture before it evaporated.

Answer 2

The answer to your question depends on what type of gas you are referring to. If the gas itself is elemental (e.g. a noble gas such as helium), then the liquid will too be an element. If the gas is a homogeneous compound (e.g. water vapour (H2O(g))), then the liquid form will to be a compound. Lastly, if the gas is a mixture (e.g. air), then the liquid will be a mixture.

Answer 3

It could be any of these:

• liquid oxygen, for example, an element, can evaporate leaving no residue
• water, a compound, can evaporate leaving no residue
• gasoline or petrol, can evaporate leaving no residue

Answer 4

Liquid gas is neither an element nor a mixture nor a compound. The term "liquid gas" is not used in chemistry to describe a specific substance. It may refer to a gas that has been cooled to a liquid state.

Answer 5

Generally speaking mixtures would leave residues.